class_docstr: A random shuffling buffer implementation. Items can be added to the buffer and retrieved in a random order.
code: def size(self):
      return self._size
  
imports: import abc
  from collections import deque
  import numpy
  import six
label_desc: Use image node_id 6 for calling the RandomShufflingBuffer obj's underlying member method code with example usage: obj.size() and returns: self